write the next four letters in this sequence A B Z Y C D

You haven't memorized the alphabet backwards. Look at this sequence...

1,2,10,9,3,4,8,7...

I will be happy to check your thinking

wouldn't it be XWEF?!

To determine the pattern in this sequence and find the next four letters, let's analyze it step by step:

The first two letters are "A" and "B", which are simply the first two letters of the alphabet.

Then we have "Z" and "Y". Notice that these two letters are placed in a reverse order from the end of the alphabet. So, we are taking the last two letters of the alphabet and reversing their order.

Next, we have "C" and "D", which are the immediate next two letters in the alphabet after "A" and "B".

Based on this pattern, we can predict the next four letters in the sequence:

E F X W

Here's how this prediction is made: We continue with the normal alphabetical order for "E" and "F". Then, for the next set of two letters, we take the last two letters of the alphabet ("Z" and "Y") and reverse their order to get "X" and "W".

Therefore, the next four letters in the sequence are: E, F, X, W